Block Diagram

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
KEY
Antenna
2402~2480MHz
BT_LED
CRYSTAL 24MHz
AMP SPKER
AC6965E CHAR_LED
5.Power 5v input
3.Key input panel
4.24M External Crystal
6.power amplifier,Audio output part
7.Blue light is Bluetooth status indicator, red light is power status indicator
1.Bluetooth antenna
MCU
USB-5V
U1
NS4165
U3
Y1
2.MCU AC6965E
A2
1
2
3
4
67
5